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File extension filetypes
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Website  EXT   Filetype description                                    
    FILExt  ---  Microsoft Backup File Set (Microsoft Corporation
    FILExt  $ED  C Editor Temporary File (Microsoft Corporation
    FILExt  $ED  C/C++ Temporary Editor File (Microsoft Corporation
    FILExt  $VM  Windows 3.x Virtual Manager Temp File (Microsoft Corporation
    TrID  ??_  Microsoft KWAJ compressed (Phil Katz's 'deflate') 
 Header Hexdump:  4B 57 41 4A 88 F0 27 D1 03 00 
    File Extensions  @@@  Screen files used in the installation and instruction by e.g. Microsoft Codeview for C 
    FILExt  ~_~  Temporary File (Microsoft Corporation
    FILExt  0  Flight Simulator Texture File (Microsoft Corporation
    FILExt  000  Doublespace Compressed Data File (Microsoft Corporation
    FILExt  001  Drivespace Virtual Drive (Microsoft Corporation
    FILExt  01$  (01$...Any Number$) Compressed Archive (Microsoft Corporation
    FILExt  2  Setup Factory 6.0 Setup Launcher (Microsoft Corporation
    File Extensions  232  Microsoft Office Install/tbv 
    FILExt  232  Office Install (Microsoft Corporation
    FILExt  386  Windows Enhanced Mode Driver or Swap File (Microsoft Corporation
    FILExt  3CN  3D Movie Maker Scene (Microsoft Corporation
    FILExt  3MM  3D Movie Maker Movie (Microsoft Corporation
    File Extensions  3MM  Microsoft 3D Movie Maker video file 
    FILExt  3TH  3D Movie Maker Thumbnail Data File (Microsoft Corporation
    File Extensions  3TH  3D Movie Maker Thumbnail Data File (Microsoft
    FILExt  5D  Works File (Microsoft Corporation
    File Extensions  8  Assembly language source code file (A86) similar to Microsoft Assembler 
    FILExt  ACA  Agent Character (Microsoft Corporation
    File Extensions  ACA  Microsoft Agent character 
    FILExt  ACC  Composer File (Microsoft Corporation
    FILExt  ACCDB  Access 2007 Database File (Microsoft Corporation
    Cryer  ACCDB  Microsoft Access 2007 database file 
    TrID  ACCDB  Microsoft Access 2007 Database 
 Header Hexdump:  00 01 00 00 53 74 61 6E 64 61 72 64 20 41 43 45  
    FILExt  ACD  Agent Character Definition (Microsoft Corporation
    FILExt  ACE  Train Simulator Texture File (Microsoft Corporation
    FILExt  ACF  Agent Character (Microsoft Corporation
    TrID  ACF  Microsoft Agent Character 
 Header Hexdump:  C4 AB CD AB 
    FILExt  ACG  Agent Preview (Microsoft Corporation
    FILExt  ACL  Access Control List (Microsoft Corporation
    FILExt  ACL  Office AutoCorrect List (Microsoft Corporation
    FILExt  ACM  Audio Compression Manager Driver (Microsoft Corporation
    FILExt  ACP  Office Assistant Preview File (Microsoft Corporation
    FILExt  ACS  Agent Character (Microsoft Corporation
    TrID  ACS  Microsoft Agent Character 
 Header Hexdump:  C3 AB CD AB 
    FILExt  ACT  FoxPro Documenting Wizard Action Diagram (Microsoft Corporation
    FILExt  ACT  Office Actor Program File (Microsoft Corporation
    FILExt  ACT  Train Simulator Activity File (Microsoft Corporation
    FILExt  ACTPROJ  Visual Studio .NET ACT Project (Microsoft Corporation
    FILExt  ACW  Accessibility Wizard Settings (Microsoft Corporation
    File Extensions  ACW  Microsoft accessibility wizard 
    FILExt  ADC  Systems Management Server (SMS) Collection Evaluator Addition (Microsoft Corporation
    FILExt  ADE  Access Project Extension (Microsoft Corporation
    File Extensions  ADE  Microsoft Access project extension file 
    Cryer  ADE  Microsoft Access project extension 
    FILExt  ADM  Windows Policy Template (Microsoft Corporation
    FILExt  ADN  Access Blank Project Template (Microsoft Corporation
    FILExt  ADP  Access Project (Microsoft Corporation
    File Extensions  ADP  Microsoft Access project file 
    Cryer  ADP  Microsoft Access project file 
    TrID  ADP  Microsoft Access Project 
 Header Hexdump:  D0 CF 11 E0 A1 B1 1A E1 00 
    FILExt  AEU  AutoRoute Express Europe Route (Microsoft Corporation
    File Extensions  AEU  Microsoft AutoRoute Express Europe route 
    FILExt  AG4  Access G4 File (Microsoft Corporation
    FILExt  AGE3SCN  Age of Empires 3 Scenario (Microsoft Corporation
    FILExt  AI  Rise of Nations AI File (Microsoft Corporation
    FILExt  AIR  Flight Simulator Aircraft Performance Info File (Microsoft Corporation
    FILExt  AKM  Microsoft Operation Manager (MOM) Management Pack (Binary) (Microsoft Corporation
    FILExt  ALX  ActiveX Layout File (Microsoft Corporation
    File Extensions  AML  Microsoft Assistance Markup Language 
    FILExt  ANI  Windows Animated Cursor (Microsoft Corporation
    FILExt  ANS  Word Text and Layout (Microsoft Corporation
    FILExt  APK  Train Simulator Packaged Activity (Microsoft Corporation
    FILExt  APPLICATION  ClickOnce Deployment Manifest (Microsoft Corporation
    FILExt  APS  Visual C++ File (Microsoft Corporation
    FILExt  AR  Midtown Madness City Add-on (Microsoft Corporation
    FILExt  ARC  Schedule+ 1.0 File (Microsoft Corporation
    FILExt  ARMX  ASP.NET Source File (Microsoft Corporation
    FILExt  ARMY  Impossible Creatures Collection of Created Creatures (Microsoft Corporation
    FILExt  ARV  AutoRoute User Information (Microsoft Corporation
    FILExt  ASA  Visual InterDev File (Microsoft Corporation
    FILExt  ASAX  ASP.NET Source File (Microsoft Corporation
    FILExt  ASCX  Web User Control (Microsoft Corporation
    FILExt  ASD  Advanced Streaming Format Description (Microsoft Corporation
    FILExt  ASD  Word Automatic Backup (Microsoft Corporation
    Wikipedia  ASF  Advanced Streaming Format (Compressed Windows audio/video) - Microsoft Corporation 
    FILExt  ASF  Advanced Streaming Format (Microsoft Corporation
    FILExt  ASHX  ASP.NET Web Handler File (Microsoft Corporation
    Wikipedia  ASMX  ASP.NET Web Service - Microsoft Corporation 
    Wikipedia  ASP  Active Server Pages of Microsoft.Net - Microsoft Corporation 
    FILExt  ASPHTML  ASP HTML (Microsoft Corporation
    File Extensions  ASPHTML  Microsoft .asp html file 
    Wikipedia  ASPX  ActiveX Server Pages of Microsoft.Net - Microsoft Corporation 
    FILExt  ASPX  ASP.NET Source File (Microsoft Corporation
    FILExt  ASR  Streets & Trips Route (Microsoft Corporation
    FILExt  ASV  Train Simulator Computed Activity File (Microsoft Corporation
    FILExt  ASX  Advanced Stream Redirector File (Microsoft Corporation
    Wikipedia  ASX  Advanced Stream Redirector file, redirects to an ASF file (see ASF) - Microsoft Corporation 
    File Extensions  ASX  Microsoft Advanced Streaming Redirector file 
    FileInfo  ASX  Microsoft ASF Redirector File 
    FILExt  ATP  Visual Studio .NET ACT Project (Microsoft Corporation
    FILExt  AVB  Chat Character File (Microsoft Corporation
    TrID  AVB  Microsoft Chat Character 
 Header Hexdump:  81 
    FILExt  AW  Answer Wizard (Microsoft Corporation
    TrID  AW  Microsoft Answer Wizard 
 Header Hexdump:  8A 01 09 00 00 00 E1 08 00 00 99 19 
    FILExt  AWD  FaxView Document (Microsoft Corporation
    TrID  AWD  Microsoft At Work Fax document 
 Header Hexdump:  D0 CF 11 E0 A1 B1 1A E1 00 
    Wikipedia  AWD  Microsoft Fax At Work Document - MS Fax At Work 
    FILExt  AWX  DirectX 8.1 (Microsoft Corporation
    FILExt  AX  DirectShow Filter (Microsoft Corporation
    FILExt  AXD  ASP.NET Web Handler File (Microsoft Corporation
    FILExt  AXE  AutoRoute Export File (Microsoft Corporation
    FILExt  AXG  AutoRoute Trip File (Microsoft Corporation
    FILExt  B!K  Flight Simulator Scenery File (Microsoft Corporation
    TrID  BAS  Microsoft QuickBASIC 4.5 source module 
 Header Hexdump:  FC 00 01 00 0C 00 81 01 82 01 06 00 01 02 03 04  
    FILExt  BAT  Batch Processing (Microsoft Corporation
    FileInfo  BCM  Microsoft Works Communications Script Backup 
    FILExt  BCM  Works Communications File (Microsoft Corporation
    FileInfo  BDB  Microsoft Works Database Backup File 
    FILExt  BDB  Works Database File (Microsoft Corporation
    TrID  BDR  Microsoft Border art 
 Header Hexdump:  58 54 01 00 
    FILExt  BDR  Publisher Border (Microsoft Corporation
    FILExt  BG  Backgammon for Windows Game File (Microsoft Corporation
    FILExt  BGB  Chat Background Graphic (Microsoft Corporation
    FILExt  BGL  Flight Simulator Scenery File (Microsoft Corporation
    FILExt  BH3  Rise of Nations Unit Graphic (Microsoft Corporation
    FILExt  BHA  Rise of Nations Unit Graphic (Microsoft Corporation
    FILExt  BHS  Rise of Nations Script (Microsoft Corporation
    FILExt  BI  Quick Basic or Visual Basic for DOS Include File (Microsoft Corporation
    File Extensions  BKF  Microsoft backup file 
    FILExt  BKF  WindowsXP Backup Utility Backup Set (Microsoft Corporation
    FileInfo  BKS  Microsoft Works Spreadsheet Backup File 
    FILExt  BKS  Windows 2000 Scheduled Backup Script (Microsoft Corporation
    FILExt  BKS  Works Spreadsheet Backup (Microsoft Corporation
    FILExt  BLD  Developer Studio MAK (Microsoft Corporation
    File Extensions  BLD  old Microsoft Developer Studio MAK 
    FILExt  BLN  Rise of Nations Campaign Media File (Microsoft Corporation
    FILExt  BND  Flight Simulator Panels File (Microsoft Corporation
    FILExt  BOE  Outlook Express Backup File (Microsoft Corporation
    FILExt  BOL  Booasm Compressed Archive Library (Microsoft Corporation
    FILExt  BOO  Microsoft Booasm.arc Compressed Archive File 
    FILExt  BOX  Systems Management Server (SMS) Temporary Holding Area (Microsoft Corporation
    FileInfo  BPS  Microsoft Works Document Backup 
    FILExt  BPS  Works Document (Microsoft Corporation
    FILExt  BS_  Bookshelf Find Menu Shell Extension (Microsoft Corporation
    FILExt  BSC  Developer Studio Browser File (Microsoft Corporation
    FILExt  BSW  Office Business Scorecard Manager Workspace File (Microsoft Corporation
    FILExt  BTR  FrontPage Binary-Tree Index (Microsoft Corporation
    File Extensions  C#  Microsoft c# 
    File Extensions  C++  C++ Source Borland C++ CodeWarrior Microsoft Visual C++ 
    FILExt  CAB  Cabinet File (Microsoft Corporation
    TrID  CAB  Microsoft Cabinet Archive 
 Header Hexdump:  4D 53 43 46 00 00 00 00 
    FILExt  CAC  Infoview (Microsoft Corporation
    File Extensions  CAC  Microsoft Infoview 
    FILExt  CAG  Clip Gallery Catalog File (Microsoft Corporation
    File Extensions  CAL  Microsoft Schedule Plus 1.0 
    FILExt  CAL  Schedule Data (Microsoft Corporation
    FILExt  CAP  NetMon Capture File (Microsoft Corporation
    Wikipedia  CAT  Device driver digital signature - Microsoft Windows 
    TrID  CAT  Microsoft Security Catalog 
 Header Hexdump:  30 
    FILExt  CAT  Security Catalog (Microsoft Corporation
    FILExt  CB  Clean Boot File (Microsoft Corporation
    File Extensions  CB  Microsoft clean boot file 
    FILExt  CBO  Interactive Training Bookmark (Microsoft Corporation
    FILExt  CBS  Computer Based Training (Microsoft Corporation
    FILExt  CCC  Internet Chat (Comic Chat) Conversation/Chatroom Log (Microsoft Corporation
    File Extensions  CCC  Microsoft Internet Chat Conversation 
    FILExt  CCR  Internet Chat Room Shortcut (Microsoft Corporation
    File Extensions  CCR  Microsoft Internet Chat Conversation Shortcut 
    FILExt  CCR  Systems Management Server (SMS) Client Configuration Request (Microsoft Corporation
    FILExt  CCT  Windows Live Messenger Contacts File (Microsoft Corp.) 
    FILExt  CDAT  Internet Security and Acceleration (ISA) Server Cache File (Microsoft Corporation
    FILExt  CDB  Pocket Access Database (Microsoft Corporation
    FILExt  CDF  Channel Definition Format (Microsoft Corporation
    FILExt  CDX  Visual Foxpro Index (Microsoft Corporation
    FILExt  CFG  Flight Simulator Aircraft Configuration File (Microsoft Corporation
    FILExt  CFL  Developer Studio Diagram (Microsoft Corporation
    FILExt  CHESSTITANSSAVE-MS  Chess Titans Saved Game File (Microsoft Corporation
    FILExt  CHI  Help File Index (Microsoft Corporation
    FILExt  CHK  3D Movie Maker Interface Data File (Microsoft Corporation
    FILExt  CHL  Internet Explorer Channel Information (Microsoft Corporation
    Wikipedia  CHM  Compiled Help File - Microsoft Windows, Help Explorer Viewer 
    FILExt  CHM  HTML Help Compiled Help File (Microsoft Corporation
    File Extensions  CHM  Microsoft Compiled HTML help file 
    FILExt  CHQ  Help Combined Full-text Search File (Microsoft Corporation
    FILExt  CIL  Clip Gallery Download Package (Microsoft Corporation
    FILExt  CIN  Cinemania (Microsoft Corporation
    File Extensions  CIN  Microsoft Cinemania file 
    File Extensions  CIN96LM  Microsoft Cinemania File 
    File Extensions  CIN96UPD  Microsoft Cinemania File 
    FILExt  CLB  Office XP Developer Code Librarian (Microsoft Corporation
    File Extensions  CLC  Microsoft Schedule+ 7-Habits Mission Statement 
    FILExt  CLC  Schedule+ 7-Habits Mission Statement (Microsoft Corporation
    FILExt  CLW  Visual C++ Class Wizard File (Microsoft Corporation
    FILExt  CMD  Command File for Windows NT (Microsoft Corporation
    FILExt  CMF  MapPoint 2006 Map File (Microsoft Corporation
    File Extensions  CMF  Microsoft MapPoint 2006 map file 
    FILExt  CMN  Systems Management Server (SMS) Collection Membership Update (Microsoft Corporation
    FILExt  CMP  Freelancer Physical Model Layout (Microsoft Corporation
    FILExt  CMP  Internet Explorer Custom Menu Plug-in (Microsoft Corporation
    File Extensions  CMP  Microsoft Internet Explorer custom menu plugin 
    FILExt  CMP  Word for DOS User Dictionary (Microsoft Corporation
    FILExt  CMW  Custom Maintenance Wizard File (Microsoft Corporation
    FILExt  CNF  Windows SpeedDial (Microsoft Corporation
    FILExt  CNS  Windows2000 Client Connection Manager Export File (Microsoft Corporation
    File Extensions  CNV  Microsoft Word conversion file 
    FILExt  CNV  Word Data Conversion File (Microsoft Corporation
    FILExt  COD  C Compiler Output (Microsoft Corporation
    File Extensions  COD  Microsoft C Compiler output 
    File Extensions  COD  Microsoft Multiplan file 
    FILExt  COD  Multiplan Data File (Microsoft Corporation
    FILExt  COL  HTML Help Collection File (Microsoft Corporation
    FILExt  COL  Movie Maker Collection File (Microsoft Corporation
    FILExt  COL  Multiplan Spreadsheet (Microsoft Corporation
    FILExt  COMFYCAKESSAVE-MS  Purble Place Saved Game (Microsoft Corporation
    FILExt  CON  Train Simulator Train/Model Identification File (Microsoft Corporation
    FILExt  CONFIG  NET Application Configuration Information (Microsoft Corporation
    FILExt  CONTACT  Windows Vista Contact File (Microsoft Corporation
    FILExt  COV  Fax Cover Page (Microsoft Corporation
    FILExt  CPE  Fax Cover Sheet (Microsoft Corporation
    File Extensions  CPI  Microsoft MS-DOS code page information file